Power belt construction



June 15, 1943. C, M CONRADSON V2,321,580

POWER BELT CONSTRUCTION v Filed Nov. 20, 1939 2 Sheees-Shee'f.v l

Y v n l/A x C) l. 4 i l.

INVENTOR.

ATTORNEYS June 15, 1943- c. M. coNRADsoN 2,321,580

' y POWER BELT CONSTRUCTION Filed Nov. 20, 1959- 2 Sheets-Sheet 2 Patented June 15, l1943 POWER BELT CONSTRUCTION Conrad M. Conradson, Detroit, Mich.; Frederick R. Walter, administrator of said Conrad M.

Conradson, deceased, si'gnments, to Oscar Wis., as trustee assignor, by mesne as- Christianson, Madison,

Application November 20, 1939, Serial No. 305,267 3 Claims.' (ci. 'i4- 233) This invention relates to power rbelt construction and has particularly to do with an improved center or reinforcing means for. a belt.

I3, having a length equal to one convolution of thel band, is placed within the outer lamination of The present invention constitutes an improvement on an invention described in my prior application, Serial No. 259,117, filed March 1, 1939. The present invention. and also that of the previous application, relates briefly to a reinforcement for a flexible continuous belt which consists of a thin metal strip rolled upon'itself to form a laminated convolute band.

The present invention contemplates the provision of frictional means between the laminations of the strip and also means for holding the convolute strip in a rolled position within the outer covering of a belt without any mechanical connections.

An object of the present invention is to provide a reinforcement for a belt whichis easily formed and which has a high degree of the fric tional contact between the laminations of the band.

Other objectsy and features of the invention having to do with details of forming the belt reinforcement and the materials used therein will be described in detail in the following description and claims.

In the drawings:

Fig. 1 is a picture of a belt.

Fig. 2 is an enlarged longitudinal section of the.

belt of Fig. l. V

Fig. 3 is a transverse section taken on the lines 3-3 of Fig. 2.

Fig. 4 illustrates a construction.

Figs. 5 through 9 illustrate details of further modifications of belt construction embodying the present invention.

The main idea of the present invention is to provide a reinforcement for a belt which consists section of a modified belt w of a convolute strip in which dependence is placed on the frictionbetween the steel strips andl an interlined covering of rubber or rubberized fabric, or both, the whole being finally vulcanized to provide a finished'enforcement unit. This idea does away for the necessity of any special joining of the ends of the strips since the friction between the elements maintains the convolution at al definite size.

One form which the invention may take is illustrated in Figs. 1, 2 and 3. The longitudinal section of Fig. 2 is taken in the space marked a` in Fig. 1. In Fig. 2, the ends of the convolute strip I are shown, identified by reference char.- acters II and I2. A rubber impregnated fabric the band. A similar strip I4, one convolution long, is placedv within the inner convolution of the band. The width of these rubberized strips I3 and I4 is greater than that of the band shown in Fig. 3. Before the strip I0 lis wound upon itself. it may preferably be coated with a light coating of rubber and after the wrapping of the strip I0 with the two strips I3 and I4, the entire assembly may be covered with a rubberized canvas I on the outside and I6 on the inside. The entire assembly may then be subjected to a vulcanizing temperature so that it becomes practic ally a solid mass. In Fig. 4. I haveshown a crossl section of a reinforced belt in which the steel strip I0 is wound simultaneously with a rubber strip 20 which is slightly wider than the steel strip. After the winding, the entire mass may be vulcanized together. Fig. 5 illustrates a reinforced belt in which the metal strip IIJ is first covered with rubber 25 and then wrapped with a rubberized fabric 2E. After the reinforcing unit is assembled, it may be vulcanized as previously described. Fig. 6 illustrates a longitudinal section of such a construction. U

Fig. '7 illustrates a modification of the invention consisting of a metal strip I0 provided with a rubber coating 21` and then rolled upon itself and wrapped with a fabric or rubberized tape 28. In some cases, the entire band may first be wrapped with a tape or rubberized fabric before the band is rolled into a convolute reinforcing strip. Fig. 9 shows the strip Wrapped with a fabric tape 30, and Fig. 8 gives some idea of the section of the beltin which this is used, there being an outer covering or wrapping 35 on the -reinforcing unit before it is placed between the rubberized canvas having a coating 36.

It should be understood that because of the extremely small dimensions involved in the thickness of the metal reinforcing strips, the presentation in the'drawings of the cross section is difcult. In some cases, it has been necessary to present somewhat of a diagrammatic showing.

What I claim is:

1. A mechanical unit for the transmission of rotary power comprising a thin metal strip wound longitudinally upon itself a plurality of times to form a laminated band, a thickness of soft, pliable material between one or more of the convolutions of said band rmlyadhering to said convolutions, and a soft, pliable covering on said entire band serving to maintain the' convolutions of said band in tight frictional contact.

2. A meciienical unit for the transmission of rotary power :comprising a. thin metal strip, a

covering oit rubberized fabric on said strip rmly adhering thereto,said strip and its covering being wound longitudinally upon itself to form a continuous, laminated band. a rubberized covering Afor said band, the coverings oi the strip and band being vulcanized together at their contactlng surfaces. 1

3. A mechanical unit for the transmission of rotary power comprising a thin metal strip, a relatively thin rubber covering on said strip rmly adhering thereto. said strip` and covering being wound longitudinally to form a continuous laminated band, a. rubber covering for said band, said coverings being iirmly adhered at their contacting surfaces by a vulcanizing process.

CONRAD M. CONRADSONl 

